(1) There are a lot of terms to keep track of, but once you know what each of these things is, it's simply a matter of adding up the proper columns.
Trade balance is the same thing as net exports, and is calculated as exports minus imports (here they already gave us imports as negative numbers), including both goods and services:
100 billion yuan + 5 billion yuan - 50 billion yuan - 20 billion yuan = 35 billion yuan
Current account balance is net exports plus net transfers:
35 billion yuan - 2 billion yuan = 33 billion yuan
Capital account balance is net return on foreign capital plus net change in foreign reserves:
20 billion yuan - 3 billion yuan - 50 billion yuan = - 33 billion yuan
Notice that the following balance of payments equation holds:
(capital account balance) + (current account balance) = 0
In theory, this should always hold. In the real world, sometimes errors or hidden assets cause the two figures to be different, but for Surplus Land we have perfect figures so the identity must be exact.
The official settlements balance is the same as the net change in foreign reserves:
- 50 billion yuan
(2) Surplus Land's current account imbalance comes from their high net exports--their trade surplus, hence the name. They are selling more goods than they are purchasing, and thereby increasing their stock of money.
They are financing this current account surplus with a capital account deficit, which in this case means depleting their foreign reserves.
This is not sustainable, because eventually they're going to run out of reserves. When that happens, they'll have no choice but to let the currency float so that it can rise in value and cancel out the trade surplus.
They may be reluctant to do so, however, as for the time being this trade surplus allows them to take in more money than they are paying out, which directly increases their GDP, and could be used to support a fiscal deficit without government debt.